Three pupils from a Tel Aviv high school are under on suspicion of repeat and systematic rape of a 13-year-old boy, police said Monday.

Police said the suspects, two of whom are minors, routinely took the victim to the school building bomb shelter, where he was raped and sexually abused.

The suspects have denied any connection to the incident.

A Tel Aviv Magistrate's Court extended the youths' suspect by three days on Monday. Police arrested them on Sunday evening.

Public defense attorneys said their clients were stunned by their arrests and the suspicions, and have denied any wrongdoing.

"My client does not know this boy and does not know a thing about the suspicions against him," attorney Shimshon Veiss told Channel 2.

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